exclusive sleep mutex mntvnode r = 0 (0xffffffff80758220) locked @ /a/asami/portbuild/amd64/src-client/sys/ufs/ffs/ffs_vfsops.c:1172

From: Kris Kennaway (kris_at_obsecurity.org)
Date: 10/30/03

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    Date: Thu, 30 Oct 2003 10:18:43 -0800
To: current@FreeBSD.org

    One of the amd64 machines died with the following. The kernel is a
    few weeks old, so this might already be fixed.

    Kris

    malloc() of "64" with the following non-sleepable locks held:
    exclusive sleep mutex mntvnode r = 0 (0xffffffff80758220) locked @ /a/asami/portbuild/amd64/src-client/sys/ufs/ffs/ffs_vfsops.c:1172
    recursed on non-recursive lock (sleep mutex) mntvnode @ /a/asami/portbuild/amd64/src-client/sys/kern/vfs_subr.c:1054
    first acquired @ /a/asami/portbuild/amd64/src-client/sys/ufs/ffs/ffs_vfsops.c:1172
    panic: recurse
    Debugger("panic")
    Stopped at Debugger+0x4b: xchgl %ebx,0x31599f
    db> where
    Debugger() at Debugger+0x4b
    panic() at panic+0x169
    witness_lock() at witness_lock+0x383
    _mtx_lock_flags() at _mtx_lock_flags+0x9c
    insmntque() at insmntque+0x2a
    vclean() at vclean+0x35b
    vgonel() at vgonel+0x51
    vrecycle() at vrecycle+0x5b
    ufs_inactive() at ufs_inactive+0x22c
    ufs_vnoperate() at ufs_vnoperate+0x14
    vrele() at vrele+0x11a
    ffs_sync() at ffs_sync+0x24f
    sync() at sync+0xdb
    syscall() at syscall+0x320
    Xfast_syscall() at Xfast_syscall+0xa7
    --- syscall (36, FreeBSD ELF64, sync), rip = 0x402084, rsp = 0x7ffffffff648, rbp = 0x3 ---
    db>

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